Personally, I like to navigate the art base using the Rhizome/artist terms and I've noticed that there can be a real gap between the terms describing pieces and the piece itself. If there is a discrepancy it is usually the subject term/s that are missing. Although the Rhizome/artist terms include words such as "landscape" and "war," and any term can be added and eventually become a rhizome term, I wonder whether it might be fruitful to seed more subject terms. Alternatively, even preferably, a category devoted to subject terms could be created.